''I have no comment,'' Wannstedt told the Herald when asked about Williams' retiring. ''Players report Friday. Right now, it's a 10-day dead period. We'll get everybody started on Friday.''

Wannstedt acknowledged talking with Williams but declined to give details of their conversation. Williams said there was no chance he would change his mind.

He said he has already told his mother Sandy, Steinberg, backup running back Travis Minor and friends and family of his decision.

In May, three South Florida newspapers reported that Williams tested positive for marijuana and faced a fine of at least $650,000 for violating the league's substance-abuse policy for a second time since joining the Dolphins.

But his attorney, Gary Ostrow, told The Associated Press: ''As far as I'm concerned, there is no violation.''

Williams told the Herald his failed marijuana tests had a minor influence on his decision to retire, but was only one of many factors. It didn't cause him to retire, he said, as much as reinforce his reasons for wanting to do so.

Williams' two seasons with the Dolphins have been the best of his career. He set a team record with 1,853 yards rushing in 2002. He followed that with 1,372 yards last season.